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Biomedical subjects

N Zohoori

Publications and source records attributed to N Zohoori.

11 recordsLinked to original sources
PubMed2003

Nutritional status of older adults in urban Jamaica.

The aim of the study was to determine the energy intake and nutritional status of a sample of Jamaican adults, and to compare them among different age groups. Measured height and weight data from a survey in Spanish Town, Jamaica, consisting of 2100 adults aged 25-74 years, with 22 per cent over age 60 years, were used to calculate body mass index (BMI). Using BMI cut-off points of 20 and 27, the prevalence of underweight and overweight, respectively, were determined for different age groups. Energy intake was calculated from a food frequency questionnaire from 967 of the respondents. Among males, mean daily energy intake declined from a high of 3681 kcal (15,401 kJ) for 25-29 year-olds, to a low of 2227 kcal (9318 kJ) for those aged 70-74 years. Corresponding numbers among females were 2935 kcal (12,280 kJ) and 1844 kcal (7715 kJ), respectively. Among those aged 65-74 years, 26.9 per cent of males and 50 per cent of females report daily energy intakes of less than 1600 kcal (6694 kJ) (below the lowest recommended dietary allowance (RDA)), compared to 4.5 and 13.7 per cent of males and females aged 25-34 years. While there are moderate declines in the prevalence of overweight, the prevalence of male underweight increased from 4 per cent among 50-54 year-olds to over 35 per cent among those 65 years and older; and among females the corresponding numbers are from 2 per cent to 10 per cent. All trends with age were significant (p < 0.005). There are significant declines in energy intake, and alarming increases in the prevalence of underweight with increasing age among males. These results are cause for concern and further research in this area is warranted.

Adult↗
PubMed2001

Nutrition and healthy functioning in the developing world.

There is a general lack of data for studying the relationship between nutrition and healthy functioning among the elderly in developing countries. Nevertheless, knowledge of biological relationships from studies in other countries can be applied to gain an understanding of what can be expected in the developing world. In this respect, the concept of the nutrition transition is important. However, nutrition transition as related to elderly populations in developing countries has not yet been adequately studied. The developing world is not homogeneous with respect to patterns of nutritional status among the elderly, and problems of both under- and overnutrition exist among different populations of the elderly and both will be important factors for future functional status levels. In addition, there are many extrinsic factors (such as socioeconomic, political and cultural factors) in these countries that are even more important in determining nutritional status and its relation to function. Unless research and policy development in developing countries escalate and keep pace with the nutrition and demographic transitions in these countries, high levels of disability and dependency are likely in the near future.

Aging↗
PubMed1997

Dies endogeneity matter? A comparison of empirical analyses with and without control for endogeneity.

PURPOSE: Using data from the Cebu Longitudinal Health and Nutrition Survey, we perform an empirical investigation of the effects of endogeneity and unobserved heterogeneity in the analysis of health outcomes. METHODS: First, we lay a theoretical background for this analysis and develop a set of expectations regarding the effects of ignoring endogeneity. Then, by modeling the effect of infant-feeding patterns on time to resumption of menses, we perform parallel analyses with and without control for endogeneity. RESULTS: We show that in this analysis, as far as the effects of endogeneity are concerned, empirical results do accord with theoretical expectations. There are differences in parameter estimates between models, that lead to somewhat different interpretations. CONCLUSIONS: We discuss the importance and implications of these findings for epidemiological studies of health outcomes. We outline the steps involved in such an analysis and discuss the practical limitations of the methods, as well as the possible gains.

Amenorrhea↗
PubMed1997

Econometric approaches to epidemiologic data: relating endogeneity and unobserved heterogeneity to confounding.

The concepts of endogeneity and unobserved heterogeneity are well-known among econometricians. However, these issues are rarely addressed in epidemiologic studies. This paper explores these two concepts, their relationship to each other, and the implications for analysis in epidemiologic studies. An endogenous variable is defined as a predictor variable which is partly determined by factors within the model itself, while unobserved heterogeneity is conceptualized as a vector of missing variables acting through the error term. Under certain assumptions, the simultaneous existence of an endogenous variable and unobserved heterogeneity is shown to act in a manner analogous to confounding. Specifically, this occurs due to an association between the error term in the equation and the endogenous predictor variable. The accepted econometric solution to this problem is to replace the endogenous variable with an 'instrumental variable' which is not correlated with the error term and thus not susceptible to confounding. The validity of these concepts and of the proposed solution are discussed.

Confounding Factors, Epidemiologic↗
PubMed1997

Recent patterns of alcohol consumption in the Russian elderly, 1992-1996.

We present data on patterns of alcohol consumption in the Russian elderly aged > or = 60 y (< or = 100 y) between 1992 and 1996. These results come from nationally representative data collected as part of the Russian Longitudinal Monitoring Survey (RLMS), based on three-stage stratified cluster probability samples of the Russian population. The data showed a decreasing prevalence of drinking during this period, but an increase in the amount of alcohol consumed by some members of this population. There were significant differences within the group, with 60-69-y-old men having both the highest prevalence and the highest amounts of alcohol consumption compared with older men and women. Although the decrease in drinking prevalence is reassuring, the increase in the absolute amount of alcohol consumption by drinkers is of concern.

Age Distribution↗
PubMed1996

The nutritional status of the elderly in Russia, 1992 through 1994.

OBJECTIVES: The purpose of this study was to ascertain how economic reform has affected nutritional well-being of the elderly in the Russian Federation. METHODS: A sample of more than 2932 Russians 60 years of age and older was selected from a nationally representative survey of Russian households. A 24-hour dietary recall and data on weight, height, and socioeconomic status were collected during 1992 and 1993 and from a separate nationally representative sample of 1955 persons in the same age group in 1994. RESULTS: Russia's elderly did not experience major declines in economic or nutritional well-being during the first 2 years of the reform period. Dietary composition shifted slightly toward reduced fat consumption. A small proportion of individuals showed signs of underweight. Of those who were underweight in 1992, none had lost more than 3 kg of weight by 1993. Among those 70 years of age and older, none who were underweight had lost any appreciable weight, although half lost small amounts. CONCLUSIONS: Many more underweight elderly people increased than reduced their weight. Mean weight increased among all body mass index groups over the year reported here. However, economic conditions in December 1994 raise concerns.

Aged↗
PubMed1996

Longitudinal analysis of the effects of infant-feeding practices on postpartum amenorrhea.

The Cebu Longitudinal Health and Nutrition Survey is used to examine the effect of various components of infant-feeding patterns on return of menses postpartum. The results show that factors such as active suckling, the use of two breasts versus one, breast-feeding on demand versus on a fixed schedule, and the feeding of other milks and of nonnutritive or low-caloric other liquids can be important under selected circumstances. Discrete-time logistic hazards modeling is used to estimate the weekly probability of return to menses.

Amenorrhea↗
PubMed1995

Does WIC participation improve breast-feeding practices?

The effects of the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) on breast-feeding behavior have been sometimes found inadequate. The determinants of breast-feeding initiation and duration among WIC participants and nonparticipants were modeled by using retrospective cross-sectional data from the 1988 National Maternal and Infant Health Survey. This study corrects for self-selection bias as far as the data allow, in addition to controlling for parents' ages, education, race, and family income. Findings suggest that prenatal WIC participation, combined with breast-feeding advice, significantly increases the initiation of breast-feeding but does not affect duration. The exact nature of effective breast-feeding advice given prenatally at WIC clinics is unclear and warrants further research.

Adolescent↗
PubMed1993

Breast-feeding patterns in the Philippines: a prospective analysis.

Data from the Cebu Longitudinal Health and Nutrition Survey have been used to examine breast-feeding patterns in the Metropolitan Cebu region of the Philippines. The results show that there is extensive and early use of non-nutritive liquids, resulting in low levels of exclusive breast-feeding. The use of cross-sectional versus longitudinal data, the definition of exclusive breast-feeding, and movements in and out of the exclusively breast-fed category, are considered.

Adolescent↗
PubMed1993

The nutrition transition in China: a cross-sectional analysis.

Diets and activity patterns are changing rapidly in low-income countries, and problems of undernutrition and overnutrition commonly exist side by side. China has conquered problems of food scarcity at the national level and has undergone a remarkable transition in the structure of its diet in the last decade. In this paper, we use data from the 1989 China Health and Nutrition Survey and national data from the State Statistical Bureau to explore China's recent history with respect to nutrition and to identify patterns of under- and overnutrition. In particular, we see that higher income levels, particularly in urban areas, are associated with consumption of a diet higher in fat and with problems of obesity. At the same time, undernutrition is a problem in important segments of Chinese society. There is a need for the Chinese government to consider ways to address these problems of deficit and excess jointly.

Adolescent↗